Nut-lock.



' N0.v72,s11. PATENTED"0CT.18,1904. A. a. LUKEHART.

NUT LOOK.

APPLICATION FILED JULY 25. 1904.

N0 MODEL.

Q v avwqwtor Wwne/Aoeo v Zaire/0a 2w To all whom it may concern.-

15 it home.

4 of the bolt and nut.

Patented October 18, 1904.

UNITED STATES PATENT ,OFFICEQ ALBERT O. LUKEHART, OF FALLS CREEK,PENNSYLVANIA.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent No. 772,811, dated October18, 1904..

Application filed July 25, 1904. 'Serial No. 218,076. (No model.)

Be it known that I, ALBERT O. LUKEHART,

a citizen of the United States, residing at Falls Creek, in the countyof Clear-field, State of Pennsylvania, have invented certain new anduseful Improvements in Nut-Locks; and I do hereby declare the followingto be a full, clear,

andexact description of the invention, such;

as will enable others skilled in the art to which it appertains to makeand use the same.

sitionto which it may be turned in screwing There are two generalclasses of these devicesone in which no provision is made for turningthe nut-lock and another in which a retrograde movement of the nut isprovided for. -My invention belongs to the latter class and is designedfor the widest range of use.

My invention consists of a dog or pawl pivoted in a recess formed in thehead of the nut,

the free end of which dog is adapted to be 2 5 pressed by means of aspring into engagement with one of the ratchet-teeth of the several rowscut longitudinally in the threads of the bolts upon which the nuts areturned, and thus hold the nut against retrograde movement. 0 A spring orother device arranged in a recess in the opposite side or end of the nutis capable of being moved and, through an operative connection withthefirst-mentioned spring, of releasing the dog and allowing the spring tobe turned back, all as will be hereinafter more fully described inconnection with the annexed drawings, and letters of reference markedthereon, forming-a part of this specification.

Of the drawings, Figure 1 is an elevation Fig. 2 is a top plan View.Fig. 3 is a bottom plan view of the nut, the bolt being shown insection. Fig. 4 is an elevation of the pawl.

Referring now to the drawings, a designates a bolt which may be of theform shown or any other needed for use. b is the nut, turned on thescrew-threaded part of'the bolt. The

latter has one or morelines or kerfs or ratchetteeth 0 cut therein, asshown, that may be en- 5 gaged by the end of the-dog or pawl d, ar-

ranged to operate in a recess formed in the bottom face of the nut, anda vertical shank 0 extends up in a recess formed in the side of the nutto the top, wherein in a top recess it is provided with aflat spring f,adapted to be operated vertically, so that it may be lifted up at itsouter end and moved laterally to one side or the other of a vertical lugg. A spring it in the bottom recess of the nut and which is controlledby the position of the flat spring f is arranged so that it may be madeto bear against the dog cl and hold it in engagement with theratchet-teeth formed on the screwthreads on the bolt.

In operation, the springf being moved out side the lug g, the pawl willbe released and the nut will be turned up or to any position it isdesired to have it, when the flat spring will be raised and moved overthe lug 9 inside of the same, and the spring 71 below will act on thedog (Z and cause it to engage a ratchettooth 0, formed on the thread ofthe bolt, and

hold the nut in fixed position.

The utility of the invention seems to be so obvious as not to call forexplanation. The

device is at once simple in construction and entirely efficientand'duralole. It is, as before stated, capable of a wide range of use,since there is nothing in the way of its employment where an ordinarynut may be used.

The nuts and bolts'may be made separately and sold as complete articlesof manufacture.

The observation is made that it is known that mechanical changes may bemade in the form and arrangement of parts without departing from thenature or spirit of the invention.

' What is claimed is-.

The nut for a bolt, hereinbefore set forth, having recessed faces, apawl in the lower face, a regulating-spring in its upper face, a lug inthe recess of the upper face on either side of which the cooperatingregulating-spring may be removed, and a connecting-shank between theregulating-spring and pawl, all combined and operating substantially asdescribed and illustrated.

In testimony whereof I affiX my signature in presence of two witnesses.

ALBERT O. LUKEHART.

